The thing is that it is possible to construct circular yoke in several ways. This yarn is dark and maybe not much can be seen but if you give it a closer look, you may realize that the placement of increases is somewhat different. I am going to elaborate on this mode and probably there will be some patterns in future. 
Two yarns are held together: one is thin mohair  (Brushed Extra Fine), 25 g/210 m  by Adele's Mohair, the other is unknown laceweight wool, probably tatavasti 100 g/1400-1500 m.